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LQFPs are confusing

A project log for Neotron Pico

A microATX motherboard that uses a Raspberry Pi Pico as the CPU. SuperVGA output, stereo audio, a BIOS written in Rust and not much RAM!

Jonathan 'theJPster' PallantJonathan 'theJPster' Pallant 06/27/2021 at 19:200 Comments

I got the first five v0.5.0 boards back. They look great! I tried soldering on the LQFP-32 STM32 (which I had in stock but JLCPCB did not), and it didn't go well.

The first one I soldered on rotated 90 degrees. Turns out the 'dot' is in the bottom left, not the top left. I'll have to get someone to fix that one with a hot air gun.

The second one went better, but was about 3 degrees out. This was enough to put the legs in between the pads on one side. No good.

The third seemed to go OK (thankfully - I only have one left!). So far, I've knocked up some firmware to blink the LEDs, check the UART and debounce the power button. It's all at https://github.com/neotron-compute/Neotron-BMC.

Video: https://twitter.com/therealjpster/status/1408534190434422795

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